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arm64: Initialize TLB memory if CMO_BY_VA_ONLY

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Memory used to hold the page tables is allocated from the top of RAM
with no prior initialization and could therefore hold invalid data. As
invalidate_dcache_all() will be called before the MMU has been
initialized and as that function relies indirectly on the page tables
when using CMO_BY_VA_ONLY, these must be in a valid state from their
allocation.

Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
[ Paul: pick from the Android tree. Fix checkpatch warnings, and rebased
  to the upstream. ]
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Tom Rini <trini@konsulko.com>
Link: e3ceef4230
This commit is contained in:
Pierre-Clément Tosi 2023-02-09 04:54:28 +08:00 • committed by Tom Rini
parent 46dc542870
commit c55c2a8565
1 changed files with 9 additions and 0 deletions
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9
arch/arm/lib/cache.c
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@ -159,6 +159,15 @@ __weak int arm_reserve_mmu(void)
*/
gd->arch.tlb_allocated = gd->arch.tlb_addr;
#endif
if (IS_ENABLED(CONFIG_CMO_BY_VA_ONLY)) {
/*
* As invalidate_dcache_all() will be called before
* mmu_setup(), we should make sure that the PTs are
* already in a valid state.
*/
memset((void *)gd->arch.tlb_addr, 0, gd->arch.tlb_size);
}
#endif
return 0;